423645846728domain: NAppears in sequencesGeneralized tangent number d(7,n).at n=4A064072Generalized Euler numbers, a(n) = n!*[x^n](sec(7*x)*(-sin(2*x) + sin(4*x) + sin(6*x) + cos(x) + cos(3*x) - cos(5*x))).at n=9A349266